These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.03 s (backtrack: 0/20).

[ebuild  N     ] acct-group/redis-0-r2::gentoo  0 KiB
[ebuild  N     ] acct-user/redis-0-r2::gentoo  0 KiB
[ebuild  N     ] dev-db/redis-8.4.6:0/8.4::gentoo  USE="ssl -jemalloc (-selinux) (-systemd) -tcmalloc -test" 4082 KiB

Total: 3 packages (3 new), Size of downloads: 4082 KiB